Not something I’ve ever tried personally, but I know a few others in the forum have looked into astral projection and other closely related aspects 
@Francisco shared some great info and goes into detail about the difference between Astral Travel, Astral Projection, and Lucid Dream in his post in Do you astral travel?
@Christine4 shared a guided meditation for astral projection.
@Quadeera addresses the fine line between the realms of dreaming and astral travel in Dreams/astral projecting.
And @Oh_My_Wonderland opened a great discussion about traveling into and exploring a Collective Consciousness.
It is a fascinating topic- I agree with @Berta that I feel it’s a bit beyond my current focus, but I love hearing everyone’s experiences and thoughts about it 
Thanks for opening up the discussion, @john4!